Pasachoff, Jay M.. <br/><br/>
Astronomy Now /  

 - 1st ed /  
 - London :   W.B. Saunders Company. 
 - p.173 :  
<br/><br/><label>ISBN: </label>0-7216-7100-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B9  / [M4]